Portal 2

Portal 2 is a first-person puzzle game developed and published by Valve and released in 2011 for Macintosh and Windows and then ported to other platforms. The game is built using the Source Engine. The game is the second in the Portal series and, like the first game, you play the mute character Chell who ends up having to go through all sorts of portal testing sequences devised by GLaDOS.

Like Portal, I didn't buy Portal 2 until long after it had been released when it was on sale in Steam.

Bad

It doesn't make sense, from a technological standpoint, for Aperture to have such amazing technology back in the 1950s, even surpassing that of what they have in the first game.

The physics for the portal gun being able to hit the moon, though fitting with the story, seems implausible.

The jokes about Chell's weight get pretty repetitive.

Some of the achievements are oddly made, and they missed the boat to award one in the stage where the emancipation grid is broken, and it's possible, though difficult, to bring a companion cube through.